/[pcre]/code/trunk/doc/pcrepattern.3
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revision 512 by ph10, Tue Mar 30 11:11:52 2010 UTC revision 513 by ph10, Mon May 3 11:13:37 2010 UTC
# Line 295  zero, because no more than three octal d Line 295  zero, because no more than three octal d
295  .P  .P
296  All the sequences that define a single character value can be used both inside  All the sequences that define a single character value can be used both inside
297  and outside character classes. In addition, inside a character class, the  and outside character classes. In addition, inside a character class, the
298  sequence \eb is interpreted as the backspace character (hex 08), and the  sequence \eb is interpreted as the backspace character (hex 08). The sequences
299  sequences \eR and \eX are interpreted as the characters "R" and "X",  \eB, \eR, and \eX are not special inside a character class. Like any other
300  respectively. Outside a character class, these sequences have different  unrecognized escape sequences, they are treated as the literal characters "B",
301  meanings  "R", and "X" by default, but cause an error if the PCRE_EXTRA option is set.
302    Outside a character class, these sequences have different meanings
303  .\" HTML <a href="#uniextseq">  .\" HTML <a href="#uniextseq">
304  .\" </a>  .\" </a>
305  (see below).  (see below).
# Line 478  convention, for example, a pattern can s Line 479  convention, for example, a pattern can s
479  .sp  .sp
480    (*ANY)(*BSR_ANYCRLF)    (*ANY)(*BSR_ANYCRLF)
481  .sp  .sp
482  Inside a character class, \eR matches the letter "R".  Inside a character class, \eR is treated as an unrecognized escape sequence,
483    and so matches the letter "R" by default, but causes an error if PCRE_EXTRA is
484    set.
485  .  .
486  .  .
487  .\" HTML <a name="uniextseq"></a>  .\" HTML <a name="uniextseq"></a>
# Line 765  The backslashed assertions are: Line 768  The backslashed assertions are:
768    \ez     matches only at the end of the subject    \ez     matches only at the end of the subject
769    \eG     matches at the first matching position in the subject    \eG     matches at the first matching position in the subject
770  .sp  .sp
771  These assertions may not appear in character classes (but note that \eb has a  Inside a character class, \eb has a different meaning; it matches the backspace
772  different meaning, namely the backspace character, inside a character class).  character. If any other of these assertions appears in a character class, by
773    default it matches the corresponding literal character (for example, \eB
774    matches the letter B). However, if the PCRE_EXTRA option is set, an "invalid
775    escape sequence" error is generated instead.
776  .P  .P
777  A word boundary is a position in the subject string where the current character  A word boundary is a position in the subject string where the current character
778  and the previous character do not both match \ew or \eW (i.e. one matches  and the previous character do not both match \ew or \eW (i.e. one matches
# Line 2580  Cambridge CB2 3QH, England. Line 2586  Cambridge CB2 3QH, England.
2586  .rs  .rs
2587  .sp  .sp
2588  .nf  .nf
2589  Last updated: 27 March 2010  Last updated: 03 May 2010
2590  Copyright (c) 1997-2010 University of Cambridge.  Copyright (c) 1997-2010 University of Cambridge.
2591  .fi  .fi
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